[Mesa-dev] [Bug 91631] Clang static analysis of libtess shows undefined values and use of memory after free

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=91631

            Bug ID: 91631
           Summary: Clang static analysis of libtess shows undefined
                    values and use of memory after free
           Product: Mesa
           Version: git
          Hardware: All
                OS: All
            Status: NEW
          Severity: major
          Priority: medium
         Component: GLU
          Assignee: mesa-dev at lists.freedesktop.org
          Reporter: net147 at gmail.com
        QA Contact: mesa-dev at lists.freedesktop.org

Using static analyzer included in clang 3.6.2:
$ ./autogen.sh 
$ ./configure
$ scan-build make
  CC       src/libtess/dict.lo
  CC       src/libtess/geom.lo
  CC       src/libtess/memalloc.lo
  CC       src/libtess/mesh.lo
  CC       src/libtess/normal.lo
src/libtess/normal.c:112:6: warning: Assigned value is garbage or undefined
  v1 = minVert[i];
     ^ ~~~~~~~~~~
src/libtess/normal.c:113:6: warning: Assigned value is garbage or undefined
  v2 = maxVert[i];
     ^ ~~~~~~~~~~
2 warnings generated.
  CC       src/libtess/priorityq.lo
  CC       src/libtess/render.lo
  CC       src/libtess/sweep.lo
src/libtess/sweep.c:779:11: warning: Use of memory after it is freed
    if( ! regUp->dirty ) {
          ^~~~~~~~~~~~
src/libtess/sweep.c:803:10: warning: Use of memory after it is freed
          eLo = regLo->eUp;
                ^~~~~~~~~~
src/libtess/sweep.c:808:10: warning: Use of memory after it is freed
          eUp = regUp->eUp;
                ^~~~~~~~~~
3 warnings generated.

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